1996 M400 Questions

Hello,

I have a line on a '96 M400 and had a couple questions.

Any specific issues to look for when I check it out?

Also, what is the steerer tube size. I've seen both 1" and 1 1/8" and I am hoping 1 1/8" just in case I want to replace the fork. The owner has a suspension fork mounted now but also has the original rigid.